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5. For boiler located in an unconfi ned space in a
building of other than unusually tight construction,
adequate combustion and ventilation air is normally
provided by fresh air infi ltration through cracks
around windows and doors.
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6. For boiler located within unconfi ned space in
building of unusually tight construction or within
confi ned space, provide outdoor air through two
permanent openings which communicate directly or
by duct with the outdoors or spaces (crawl or attic)
freely communicating with the outdoors. Locate one
opening within twelve (12) inches of top of space.
Locate remaining opening within twelve (12) inches
of bottom of space. Minimum dimension of air
opening is three (3) inches. Size each opening per
following:
a. Direct communication with outdoors. Minimum
free area of one (1) square inch per 4,000 Btu per
hour input of all equipment in space.
b. Vertical ducts. Minimum free area of one (1)
square inch per 4,000 Btu per hour input of all
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A.
Move boiler to approximate installed position.
B.
Remove all crate fasteners.
C.
Lift and remove outside container. Save two of the
wooden slats from the container sleeve for use in Steps
E and F.
D.
Remove all boiler hold-down fasteners.
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c. Horizontal ducts. Minimum free area of one (1)
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7. Combustion Air/Ventilation Duct Louvers and
Grilles. Equip outside openings with louvers to
prevent entrance of rain and snow, and screens to
prevent entrance of insects and rodents. Louvers and
grilles must be fi xed in open position or interlocked
with equipment to open automatically before burner
operation. Screens must not be smaller than ¼ inch
mesh.
Consider the blocking effect of louvers, grilles and
screens when calculating the opening size to provide
the required free area. If free area of louver or grille
is not known, assume wood louvers have 20-25
percent free area and metal louvers and grilles have
60-75 percent free area.
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E.
Tilt the boiler to it's front side or back side and slide a
wooden slat under the three raised feet.
F.
Tilt the boiler in the opposite direction and slide another
wooden slat under the three raised feet.
G.
Slide the boiler left or right off the skid using the two
wooden slats as runners.
H.
Move boiler to its permanent location.
equipment in space. Duct cross-sectional area
shall be same as opening free area.
square inch per 2,000 Btu per hour input of all
equipment in space. Duct cross-sectional area
shall be same as opening free area.
Alternate method for boiler located within
confi ned space. Use indoor air if two permanent
openings communicate directly with additional
space(s) of suffi cient volume such that combined
volume of all spaces meet criteria for unconfi ned
space. Size each opening for minimum free area
of one (1) square inch per 1,000 Btu per hour
input of all equipment in spaces, but not less than
100 square inches.
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7
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